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101 lines
4.3 KiB
Python
101 lines
4.3 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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Smooth.py
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---------
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Date : November 2015
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Copyright : (C) 2015 by Nyall Dawson
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Email : nyall dot dawson at gmail dot com
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************
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"""
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__author__ = 'Nyall Dawson'
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__date__ = 'November 2015'
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__copyright__ = '(C) 2015, Nyall Dawson'
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# This will get replaced with a git SHA1 when you do a git archive323
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__revision__ = '$Format:%H$'
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from qgis.core import (QgsFeatureSink,
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QgsProcessing,
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QgsProcessingException,
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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterFeatureSink,
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QgsProcessingParameterNumber)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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class Smooth(QgisAlgorithm):
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INPUT = 'INPUT'
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OUTPUT = 'OUTPUT'
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ITERATIONS = 'ITERATIONS'
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MAX_ANGLE = 'MAX_ANGLE'
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OFFSET = 'OFFSET'
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def group(self):
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return self.tr('Vector geometry tools')
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def __init__(self):
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super().__init__()
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def initAlgorithm(self, config=None):
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self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT,
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self.tr('Input layer'), [QgsProcessing.TypeVectorPolygon, QgsProcessing.TypeVectorLine]))
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self.addParameter(QgsProcessingParameterNumber(self.ITERATIONS,
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self.tr('Iterations'),
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defaultValue=1, minValue=1, maxValue=10))
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self.addParameter(QgsProcessingParameterNumber(self.OFFSET,
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self.tr('Offset'), QgsProcessingParameterNumber.Double,
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defaultValue=0.25, minValue=0.0, maxValue=0.5))
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self.addParameter(QgsProcessingParameterNumber(self.MAX_ANGLE,
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self.tr('Maximum node angle to smooth'), QgsProcessingParameterNumber.Double,
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defaultValue=180.0, minValue=0.0, maxValue=180.0))
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self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Smoothed')))
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def name(self):
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return 'smoothgeometry'
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def displayName(self):
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return self.tr('Smooth geometry')
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def processAlgorithm(self, parameters, context, feedback):
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source = self.parameterAsSource(parameters, self.INPUT, context)
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iterations = self.parameterAsInt(parameters, self.ITERATIONS, context)
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offset = self.parameterAsDouble(parameters, self.OFFSET, context)
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max_angle = self.parameterAsDouble(parameters, self.MAX_ANGLE, context)
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(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
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source.fields(), source.wkbType(), source.sourceCrs())
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features = source.getFeatures()
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total = 100.0 / source.featureCount() if source.featureCount() else 0
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for current, input_feature in enumerate(features):
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if feedback.isCanceled():
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break
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output_feature = input_feature
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if input_feature.geometry():
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output_geometry = input_feature.geometry().smooth(iterations, offset, -1, max_angle)
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if not output_geometry:
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raise QgsProcessingException(
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self.tr('Error smoothing geometry'))
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output_feature.setGeometry(output_geometry)
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sink.addFeature(output_feature, QgsFeatureSink.FastInsert)
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feedback.setProgress(int(current * total))
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return {self.OUTPUT: dest_id}
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